Sliding-door lock



. 2 Sheets-Sheet 1 A. F. LEWIS. SLIDING DOOR LOCK.

(No Model.)

Patented Apr. 27, 1897.

2 4 6 e h S w e e h S 2 m S W 6 F M AH S M d 0 M o w No. 581,511.Patented Apr. 27, 1897.

lillllllll- |IllIIllllllllllllllllmllll-mlll .urum wAsHmm-uv u c UNITEDSTATES ALBERT F. LEWVIS, OF CHICAGO, ILLINOIS.

SLIDING-DOOR LOCK.

SPECIFICATION forming part of Letters Patent No. 581,511, dated April27, 1897.

Application filed November 4, 1895. Serial No. 567,889. (No model.)

To all whom it may concern:

Beit known that I, ALBERT F. LEWIS, a citizen of the United States,residing in the city of Chicago, county of Cook, and State of Illinois,have invented certain new and useful Improvements in Sliding Door Locks,of which the following is a specification.

My invention has for its object the providing of a novel and efficientlock mechanism for the class of doors generally designated as slidingdoors; and my invention consists in the features and details ofconstruction hereinafter described and claimed.

In the drawings, Figure I is a side elevation of my lock with theface-plates removed and representing the parts in a locked position;Fig. II, a similar view representing the lock in an unlocked position;Fig. III, a similar view showing the same in the act of throwing out thelatch, and Fig. IVa View showing the various parts of the lock mechanismin detail.

The latch-bolt a is acted upon by an eccentric cylinder 1), into whichthe key is inserted to lock andunlock the bolt. A pivoted tumbler c isprovided to hold the cylinder in place and also to keep it from beingturned except by the proper key. When the lock is being unlocked,theplate cl throws back the tumbler. The eccentric cylinder has afinger-piece 6, provided with a hook-shaped end adapted to engage over astud or projection 9 upon the latch-bolt when locked. In this positionit is apparent that the latch-bolt cannot be raised to release it fromengagement, as hereinafter specified.

A catch device comprising a suitable heavy spring h or a strip of anysuitable flexible material is secured, preferably, at one end in arecess or keeper m in the edge of that door adjacent to the onecontaining the lock mechanism when applied to double doors, or in thedoor-casing when applied to a single door. This spring is curved at itsend and adapted to be engaged by the end of the latchbolt, which issuitably hook-shaped or otherwise adapted to catch over the spring orcatch device. In order to regulate the position of the catch device withrespect to the latch-bolt or to regulate the pressure of the latch incase the lock should be let in too deep, a set-screw Zis employed tomove such catch device in or out, as desired. If the doors should notdraw together perfectly tight, the set-screw may be turned in slightly.

The part m may be called the keeper, and is of the same size as thelock, for it may have in it a pull for drawing out the door, the same asthe lock. Fora single door, however, the keeper may consist simply ofthe face-plate s and hook h.

A suitable light spring 1?. is provided for the latch-bolt withsufficient pressure or tension to keep the same from rattling. A wirespring 3' of the ordinary strength, as used in common door-locks, isemployed to keep the latchbolt tight against the cylinder. This springcatches over a hook 0, as shown in the drawings. The part if is a hookto the pivoted tumbler and serves to keep the cylinder in place. Theletter p shows where the parts are cut away in order to show the Workingportions of my look.

In the actuation of the lock the same is operated by a key 00 fromeither side of the door. The tumblers for the different locks may be ofa different shape, so that a separate key is required for each look. Inthe act of locking the eccentric cylinder is turned by the key and thelatch thereby moved. In looking, the cylinder causes the latch to moveoutwardly and horizontally, then downwardly into the catch device, andfinally backwardly. At this time the hook of the latch-bolt has engagedthe lip of the catch and a close engagement between the parts isobtained. It is obvious that it is not necessary that the doors shouldbe perfectly tight together to permit the latch to engage or catch overthe hook h. Consequently with my look any door which may not beaccurately made or become imperfect in fit may nevertheless be locked.\Vhen the latch-bolt is thus engaged by the catch, the finger-piece chas engaged single door. It is preferably designed that the cylindershould act on the latch as a lever with increasing force as the latch islocked.

Although I have described more or less precise forms and details ofconstruction, I do not intend to be understood as limiting myselfthereto, as Icontemplate changesin form, proportion of parts, and thesubstitution of equivalents, as circumstances may suggest or renderexpedient, without departing from the spirit and scope of my invention.

I clain1- 1. Inaloclgthe combination of a latch-bolt, means for givingthe bolt an outward, downward and backward movement and a flexible catchdevice engaged by the bolt upon its backward movement.

2. In a lock,the combination of a latcl1bolt, an eccentric actuating thebolt and adapted to give the same an outward, downward and backwardmovement and a flexible catch device comprising a resilient strip havinga hook into which the bolt enters in its outward and downward movementand by which it is engaged in its backward movement.

3. In a lock,the combination of a latch-bolt, hook-shaped at its outerend, an eccentric actuating the bolt and adapted to give the same anoutward, downward and backward movement and a catch device having anupwardly-opening hook into which the hookshaped end of the bolt entersin its outward and downward movement and against which such hook-shapedend engages in its backward movement, the hook portion of the catchdevice being adjustable toward and away from the bolt.

4. I11 a lock, the combination of a cam, a

latch-bolt actuated thereby, a flexible and adjustable catch deviceadapted to be engaged by the latch-bolt, and locking mechanism forholding the latch-bolt locked in position, such locking mechanismcomprising a lug 9 upon the bolt and a fin ger-piece e engaging the lugg when the cam is turned to cause engagement of the bolt and catchdevice.

5. In alock,the combination of a latch-bolt, a catch device adapted toengage the bolt, a key-actuated cam or eccentric for operating the bolt,a lug or projection upon the bolt, a locking-finger located upon the camand adapted to engage the lug and hold the bolt and catch device inengagement.

0. In alock,the combination of a latch-bolt, a flexible catch deviceadapted to be engaged thereby and comprising a strip of suitableflexible material curved at one end, key-actuated tumblers, and a cam oreccentric controlled by the key and tumblers and adapted to operate thebolt.

'7. In alock,thc combination of alateh-bolt, a cam device B foractuating the same, a spring or flexible plate h upwardly curved at itslower end and adapted to be engaged at such curved end by the end of thebelt, a fingerpiece 6 upon the cam device, a lug or projection 9 locatedupon the bolt and adapted to be engaged by the piece 6 to hold the endof the bolt and the spring h in engagement, and tumblers C and I) forcontrolling the 1novement of the cam device.

ALBERT F. LEWIS.

-Witnesses:

GENEVIEVE Lnwrs, EMMA Lnwis.

